Hi Joseph. You pose a great question.
First, I would encourage you to reach out to your local section Earth Day coordinator, who may be able to provide you with available resources (complimentary Celebrating Chemistry publications for example, to distribute to students, parents, and teachers attending your school's fair or other events you may be planning or participating in). The ACS Online Store also features Earth Day merchandise you can peruse as well; if your teachers are ACS members, they can receive 10% member discounts when they place orders online.
Finally, I can introduce you to the Organize an Event webpage, which provides suggestions for Earth Day events, along with a checklist of tips to guide you through planning & promoting, executing, and evaluating your activities.
Thank you for the resources, these are great helps and definitely a good point in the right direction.